Those containers hold 18.9 litres which is 18.9 kg roughly converted to pounds by multiplying by 2.2 equals 41.58 pounds.
that container, if full, weighs around 2 pounds. so yeah it would do some damage to a person.
That container, if filled with water, would weigh at least 20 pounds.
Looks like a 5 gallon jug so more around 40lbs.